2y+21=5y-9

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Solution for 2y+21=5y-9 equation: 



2y+21=5y-9

We move all terms to the left:

2y+21-(5y-9)=0

We get rid of parentheses

2y-5y+9+21=0

We add all the numbers together, and all the variables

-3y+30=0

We move all terms containing y to the left, all other terms to the right

-3y=-30

y=-30/-3

y=+10

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